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  • TI Thinks Resolved

TPA3116D2: Bridge IC for converting Class-D amplifier output to line output

Guru 33380 points

Replies: 15

Views: 700

Part Number: TPA3116D2

Hi,

Could you please suggest the bridge IC for converting the Class-D amplifier output to the line output ?
I am considering attenuating the output signal of the TPA3116D2 using the potentiometer, the operational amplifiers and outputting the attenuated signal to the line out output.
For the line driver DRV632 is reasonable, but the operational amplifiers that can attenuate the audio signal to approximately from -26 dB to 0 dB with the potentiometer are necessary.
So, could you please review the attached TINA-TI schematic which is designed based on the following application note ?

TPA3116D2_OPA1611_DRV632.TSC

TPA3116D2EVM Evaluation Module
http://www.ti.com/lit/ug/slou336b/slou336b.pdf

TIPD118 Verified Design Reference Guide
http://www.ti.com/lit/ug/slau518/slau518.pdf

DRV632EVM Evaluation Module
http://www.ti.com/lit/ug/slou301/slou301.pdf

Best regards,
Kato

  • In reply to Sadanori Kato:

    Hi Guru,

    Yes, you are correct, postive and negtive supplies are required for pop-free line drive if use one piece TPA1611. Below is a circuit using postive power, but there is pop when use it.

    4062.TPA3116D2_OPA1611_DRV632.TSC

    Dylan

  • In reply to Dylan Yao:

    Hi Dylan-san,

    Thank you for your support.

    Considering the output offset voltage of TPA3116D2, I think that the dc blocking capacitor is necessary.
    In addition, is there a need for 200 kΩ load resistors proposed by Xiaolin-san ?

    Could you please give me your advice ?

    Best regards,
    Kato

  • In reply to Sadanori Kato:

    Kato,

    yes, DC blocking is necessary. But be careful about the pop noise during DC offset build up stage when power up. If need pop free, i think DRV632 is still required..

    I forgot the 200Kohm, it is still required.



    Dylan
  • In reply to Dylan Yao:

    Hi Dylan-san,

    Thank you for your quick response.

    I added the dc blocking capacitors to the suggested schematic(4062.TPA3116D2_OPA1611_DRV632_Modified1.TSC), but it seems that TL431 cannot drive the blocking capacitor.
    Then, I changed that to the reference voltage which is obtained by dividing a supply voltage(AVDD) with the resistors.
    So, could you please double-check the updated schematic "4062.TPA3116D2_OPA1611_DRV632_Modified2.TSC" just in case ?

    4062.TPA3116D2_OPA1611_DRV632_Modified1.TSC

    4062.TPA3116D2_OPA1611_DRV632_Modified2.TSC

    By the way, I am considering using DRV632EVM as the line driver.

    Best regards,
    Kato

  • In reply to Sadanori Kato:

    Hi Dylan-san,

    I updated to drive the reference voltage with OPA1611, so could you please double-check the updated schematic "4062.TPA3116D2_OPA1611_DRV632_Modified3.TSC" just in case ?

    4062.TPA3116D2_OPA1611_DRV632_Modified3.TSC

    Best regards,
    Kato

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